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ARC: optional cache-line isolation of the reference count #403

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ARC: optional cache-line isolation of the reference count #403

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425deba
Replace __sync reference-count atomics with std::atomic
DTW-Thalion Jul 14, 2026
79eb446
ARC: shard the weak-reference table
DTW-Thalion Jul 24, 2026
fffa53b
ARC: increment/decrement reference counts with fetch_add instead of a…
DTW-Thalion Jul 21, 2026
e4a58ca
ARC: cache-line isolate the reference count by default
DTW-Thalion Jul 21, 2026
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3 changes: 2 additions & 1 deletion Test/FastRefCount.m
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Original file line number Diff line number Diff line change
Expand Up @@ -85,7 +85,8 @@ int main()

const long refcount_shift = 1;
const size_t weak_mask = ((size_t)1)<<((sizeof(size_t)*8)-refcount_shift);
const size_t refcount_mask = ~weak_mask;
const size_t guard_mask = weak_mask >> 1;
const size_t refcount_mask = ~(weak_mask | guard_mask);
const size_t refcount_max = refcount_mask - 1;

size_t get_refcount(id obj)
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